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I've done this as a kid. We used look for a fat little worms called a "lugworm" which you could approximate where they were by little squiggles of sand at low tide. I was almost like the shape you get if you gave a tube of paste a good squeez if you follow.

Jimbo: Yo Dave! 'Lugworm' sounds familiar, though I can't imagine how, since I grew up in the midlands, far away from any coastal area where they might have been. Maybe it's juyst that I was well read?